Earlier this summer Beyoncé had the largest Instagram fan base but Kardashian—and her constant stream of attention-grabbing photos—overtook the "Drunk in Love" singer in August. However, the Selfish author's lead proved to be short-lived: After a few weeks, Swifties united to push the 25-year-old from the No. 3 spot into the top slot.

Swift naturally marked her latest accomplishment with an Instagram post, in which she thanked her followers and attributed her giant number of fans to a specific reason. She wrote in the caption, "50 million followers!! Thanks so much guys. I'm pretty sure this is just because I have cute cats though":